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A073987 Number of strings of length n over Z_6 with trace 2 and subtrace 4. 22
0, 1, 3, 12, 126, 1296, 9072, 52488, 297432, 1700352, 9843120, 58576608, 356638464, 2176782336, 13162730688, 78940272384, 471877757568, 2821109907456, 16894457846784, 101361597378048, 608764662139392, 3656220357427200, 21947909832446976, 131685972252346368 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Same as the number of strings of length n over Z_6 with trace 4 and subtrace 4.

LINKS

Table of n, a(n) for n=1..24.

F. Ruskey Number of strings over Z_6 of given trace and subtrace

_Max Alekseyev_, PARI/GP scripts for miscellaneous math problems

FORMULA

a(n; t, s) = a(n-1; t, s) + a(n-1; t+5, s+5t+1) + a(n-1; t+4, s+4t+4) + a(n-1; t+3, s+3t+3) + a(n-1; t+2, s+2t+2) + a(n-1; t+1, s+t+1) where t is the trace and s is the subtrace.

CROSSREFS

Cf. A073971, A073972, A073973, A073974, A073975, A073976, A073977, A073978, A073979, A073980, A073981, A073982, A073983, A073984, A073985, A073986, A073988, A073989, A073990, A073991, A073992, A073993, A073994.

Sequence in context: A209065 A124153 A162127 * A138392 A152544 A035087

Adjacent sequences:  A073984 A073985 A073986 * A073988 A073989 A073990

KEYWORD

easy,nonn

AUTHOR

Frank Ruskey and Nate Kube, Aug 16 2002

EXTENSIONS

Terms a(11) onward from Max Alekseyev, Apr 09 2013

STATUS

approved

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Last modified November 20 21:20 EST 2014. Contains 249754 sequences.